P0163 O2 Sensor Circuit Low Voltage Bank 2 Sensor 3

Sensor 3 on bank 2 is a switching oxygen sensor behind a second converter or converter brick. It is rare – documented for Jaguar Land Rover's supercharged V6 and V8 (2013–2016), where it is the 'post-cat' sensor of the second bank, and for Ford systems that monitor part of the converter volume. P0163 means the signal stays close to 0 V – typically the signal wire is shorted to ground; on some modules an open circuit is also reported this way, and an exhaust leak ahead of the sensor can make it read lean. For the bank 2 sensor 2 counterpart GM uses below 50 mV within 50 s, Ford a pull-up resistance check (short below 10 Ω, open above 1 MΩ). Jaguar Land Rover assigns the code to that sensor and names software (fixed by reconfiguring the engine module) and water-induced thermal shock as causes; no thresholds are published for sensor 3, so the logic follows the sensor 2 checks. When it fails, the downstream evaluation of that converter is suspended; there is no limp mode.

Likely causes

Symptoms

• Check engine light on (usually after two drive cycles)
• Catalyst readiness incomplete
• Usually no noticeable change in driving

Repair estimate

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

Related codes

References: law.cornell.edu, static.nhtsa.gov, static.nhtsa.gov, static.nhtsa.gov.